Bobbin for braiding-machines



C. WILDI. 11055111 FOR 511111111110 MACHINES.

. APPLICATION FILED SEPT. 11. 1919. 1,354,084, PatentedSept. 28, 1920.

2 SHEETSSHEET I.

F245 )M z I 1,354,0 4, PatentedSept. 28,1920.

C. WILDI.

BOBBIN FOR BRAIDING MACHINES.

APPLICATION FILED SEPT. |1..1919.

2 SHEETSSHEET 2.

PATENT OFFICE.

UNITED STATES CARL WILDI, OF WOHLEN, SWITZERLAND, AS-SIGNOR TO THE FIRMOF ARGOVIA A.-G., OF MELLINGEN, SVFITZERLAND.

BOBBIN FOR BRAIDING-MACHINES.

Application filed September 11, 1919.

To all whom it may concern:

Be it known that ILCA'RL VILDI, a citi- Zen of the Republic ofSwitzerland, residing at lVohlen, Aargau, Valtenswilerstrasse,

Switzerland, have invented certain new and useful Improvements inBobbins for Braiding-Machines; and I do hereby declare the following tobe a clear, full, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and toletters or figures of reference marked thereon, which form a part ofthis specification.

In some braiding machines in which the bobbins are caused to'travelalong sinuous guide curves the yarn holder carrying the yarn or threadrotatably mounted thereon is designed as a tube or quill, and thetension device is a weight or spring,usually mounted on said tube. Thisarrangement presents disadvantages when the thread has to be pulled oil,and the quantity of yarn that can be wound on the tube or quill isconsiderably reduced owing to the large diameter that has to be given tosaid tube or quill.

In another kind of bobbin of the type referred to the thread is wound ona solid core or spindle provided with locking teeth at its bottom. Thelocking mechanism is thus arranged beneath the yarn so that the latterhas to be shifted vertically to an amount corresponding to the spacetaken up by the locking mechanism. The result of this is a considerableincrease of the height of the whole bobbin and a more complicated designof the locking mechanism.

In a further type of bobbin of the class referred to the tube or spoolfor the yarn projects upwardly beyond the yarn and is used for themounting of the locking mechanism; this involves either a too greatdiameter of the tube or spool or it renders the removal of the emptytube or spool and the putting on of a full bobbin more difiicult. I

Finally, in a fourth type of bobbin the mechanism for the gradualdelivery of the thread, as well as the thread guard, are ar- I rangedwholly outside the diameter of the bobbin. The locking member of thisbobbin engages into the toothed portion of the "nObblIl spool but ismoved in vertical direc- Specification of Letters Patent.

Patented Sept. 28, 1921,.

Serial No. 323 217.

tion. As a result of this the spool cannot be designed so as to passthrough the whole bobb1n, and a very complicated arrangement has to beprovided in order to allow the bobbin to swing sidewise, or, in case thespool passes through the whole bobbin and serves only as a bearing forthe latter, very inconvenient steps, involving a great loss of time,have to be carried out for exchanging bobbins, as a portion of thebobbin has to be wholly removed therefrom or at least turned up.

Moreover, the design of all the abovementioned constructions meets onlythe requirements occurring at low speeds, and will not do for very highspeeds of braiding machines, as the single parts of the bobbinsreferredto cannot resist the very high stresses occurring when themachine runs at a very high speed, (for instance at 300 revolutions ofthe fly-wheel per minute).

The object of this invention is to provide a bobbin for braidingmachines not presenting any of the above mentioned disadvantages.

To this end the bobbin according to this invention comprises a devicefor the gradual delivery of the thread having a locking lever pivoted ona tension standard which is arranged together with a thread guard andtake-up mechanism at such a distance from the axis of the bobbin that itis situated beyond the periphery of the fully wound or loaded tube,quill or spool. The locking lever itself is engaged by the thread and iscaused by the tension of the thread to engage from one side a member orratchet for the gradual delivery of the thread provided on the yarncarrier, whether spool or quill, and this lever is so arranged as toswing beyond the maximum diameter of a fully wound bobbin to be placedon and an empty one removed from the bobbin carrier withoutmanipulations of any kind.

The present invention also solves the problem of providing a bobbin forhigh speed braiding machines requiring very simple handling, with a veryadvantageous and very strong construction of all parts, whereby thenumber of the different parts is reduced to the smallest number.

The invention will now be particularly described with reference to theaccompanying this invention, and

drawings, which illustrate, by way of example, several modes of carryingthe inven- 7 tion into effect. In these drawings- Figure 1 illustrates afront view of a first construction according to this invention,

Fig. 2 is a side view of this bobbin seen from the right hand side ofFig. 1

storage of threadwound upon a yarn holder consisting of a thin tube orquill a. The latter, which may be made of card-board, is pushed onto andfrictionally held on a sec ond tube (Z provided at its upper end with atoothed disk (1 formed integral withthis The disk cl as well as the tube(Z tube. I

The tube cZ may be made of sheet metal.

'is so shaped that it securely maintains in proper position the quill 0pushed on it by hand. The tube (Z is loose on the spindle a.

' sisting of a piece of metal 7 mounted on the V 40 l follows "edesignates a post carrying'the locking lever or pawl 70 is (forming apart of a mechanism for the gradual delivery of thread from the bobbin6) and the'device for equalizing the tension or pull of the thread andthe take-up. The post 6 also carries the thread guard or detector,conlower end of the post e and vertically movable thereon. 9 1s atake-up spring secured at its lower end to the thread guard 7' and"serving to take up the thread. To this end said s'pringg maybe elongatedand contr'acted respectively by a take-up roller 70 and a shaft carriedby this roller when the pull of the thread increasesor decreases, so

that the thread remains always tensioned. One end of the shaft z is bentunder the roller h in the form of a hook to which the upper endof'spring g is attached. The locking pawl 70, 7a is pivotally mounted ona shaft Z secured to the post 6.

The described construction operates as ,When the quill c'with the threadwind ing Z) thereon has been pushed onto the spindle a, the thread isdrawn over one of the two hooks mor n ofthe post 6 and-then over thehook 0 of said post 6 and the hookshaped arm of 'the pawl, whereupon itis passed around the roller h in order to be finally pulled through .thehole provided in the bent upper end of the post e. When this has beendone, the threading is completed. The two hooks m and n arranged atdifferent levels are provided for in order to prevent a lifting of thewhole bobbin of the bobbin 6. l/Vhen the upwardly directed verticalcomponent of the tension of the threadis at this time greater than theweight of the bobbin the latter will be lifted upward, which causesirregularities in the gradual delivery of the thread and con; sequentlyin the pattern of the braiding work. The arrangement of the hooks m andn is such, that the hook n is advantageously used when weaker threadshave to be worked up and a weak spring 9 is used,'as in this case thevertical component of the thread tension referredto is less than theweight of. the bobbin. WVhen, on the contrary, strong or repeatedlytwisted or plaited yarns have to be worked up, the yarn to be threadedis passed around the hook m, so that no upwardly directed verticalcomponent of the thread-tension of any great value will be present, andconsequently any lifting of the bobbin is avoided.

Whilethe braiding machine is in opera tion the arm is of thedouble-armed pawl 70, is is continuously drawn downward by the tensionof the thread, so that the looking arm is" of this pawl is caused toengage into the locking wheel cZ provided in connection with the bobbinb. The thread is thusprevented from being drawn off. As soon as thebobbin starts to move away from the braiding point, the thread tensionis increased, the. take-up roller it moves upward in; its guide-slot r,the spring 9 being thereby tensioned; In consequence of this the lockingpawl is forced with continually increasing power into the locking wheel(2 until the roller 77L strikes from beneath the arm k-of the lockingpawl, which arm upon a'further increase "of the tension 'of the threadis then forced upward, so'that the arm is is caused "to disengage thelocking wheel. This position of the pawl L, 7c is shown in Fig, 1 inpoint and dashflines. At this moment the bobbin 6 is released, and inconsequence'of-the tension of the thread, it is then caused torotatefto' deliver certain aniountof thread. The take up spring 9 thenimmediately contracts, anditlie arm 24: of the lock ng pawl very. soondrops back into its initial 'posit1on,"the revolving bobbin beingsimultaneously arrested. so that only a quantity of yarn will bedelivered upon a rotation of the bobbin corresponding to the pitch ofthe teeth of theflocking wheel d. In the meantime the whole bobbin isagain approached to the braiding'point. Owing to thls, thread will bereleased and pulled out in consequence of a contraction of the spring 9so that a certain tension of the thread will be constantly maintained.

The thread guard f becomes operative as soon as the thread breaks, orupon exhaust of the thread supply. The weight of this thread guard f isso small that even when operating with very weak yarns it is stilllifted upward to such an extent byv the pull exerted by the spring as toengage the stops g provided on the post e. In the course of the braidingprocess it then remains in this uppermost position until the tension ofthe spring wholly ceases to act, which is the case when the threadbreaks or the supply of thread becomes exhausted. The roller it togetherwith the spring 9 and the thread guard f will then drop, the lattercausing, in its lowermost position, in a well known manner,'the stoppageof the machine.

The hereinbefore described arrangement involves several advantages. Theheight of the bobbin is reduced compared to the mass of yarn containedthereon, the attendance on the machine is rendered very simple and thethread can be drawn out very quickly. At the same time, the arrangementof the different parts of the bobbin is such that they can all be madeso strong as to be able to resist the greatest strains to which they maybe subjected, a condition which should always be fulfilled in view ofthe detrimental forces occurring at the very high speeds at which themachines provided with bobbins of the hereinbefore described type haveto run. This is especially so with regard to the members m n 0 p g whichare all very strong and formed integral with the post 6. The roller itmay be made of a material having a small specific weight in order tofacilitate its rapid upward and downward movement.

The embodiment shown in Figs. 4 and 5 diifers in so far from that firstdescribed as the roller h is replaced by a hook 71. adapted to bedisplaced vertically along the post 6. The hooks m n 0 are furtherreplaced by eyes bearing the same reference letters as the correspondingparts of Figs. 1 and 2, and the arm is of the pawl 7c is is alsoprovided with an eye for the passage of the thread. The arm k is urgedby a spring gt, fixed at one end to the post 6 and at the other end tothe arm la, against the circumference of the disk cl rigidly connectedto the spool cl carrying the bobbin 6 so that it is adapted to arrestsaid disk cZ owing to the friction that it produces on the circumferenceof the latter. The remainder of the construction of this bobbin and themanner of its operation correspond to that of the first embodiment,corresponding parts being designated by the same reference letters.

In the hitherto described embodiments of my invention two hooks or eyesare provided on the carrier constituted by the post e, one beingarranged approximately in the middle of the coil of yarn and beingdestined to be used in connection With threads, while the other isprovided near the lower end of the bobbin and is destined for pullingoff strong yarns. In these embodiments a change in the direction of thethread occurs between the point at which the thread is drawn oif at thetime from the bobbin and the hook andeye, the thread being at one timestrongly inclined relatively to the axis of the bobbin and at anothertime perpendicular to said axis. In the inclined position of the threadthe tension of the thread resolves itself into a vertical and horizontalcomponent of which only the latter has the tendency to rotate the bobbinon its spindle a.

The design of the embodiment illustrated in Figs. 6 and 7 is improved inthis respect. In this construction 1" designates a hook fixed to a flatpiece 8. The latter is automatically adjustable longitudinally of thecarrier 6 and two split pins t serving to keep two weights u (of whichonly one is shown in the drawings) in proper position, are passedthrough said piece 8.

The thread pulled oil the bobbin 6 passes over the hook 1 and the hook 0fixed to the post 6, and is guided from here to the hook-like arm is ofthe locking pawl is, It, and then around the roller it in order to befinally guided away from the bobbin through the eye 12.

The parts 9 h 7a is act in the same manner as the corresponding parts ofthe first described embodiment. The hook 1" together with the fiatmember 8 slides along the post 6. By putting a greater or less number ofweights at on the flat piece 8 the weight of the latter can be soproportioned relatively to the spring 9 that it is kept, together withthe hook r, by the thread tension, at such an elevation as to cause thethread to run off the bobbin at a right angle. The uppermost and thelowermost positions of the vertically adjustable weight, constituted bythe flat piece 8 and the weights u put onto the latter, are determinedby the stops 4).

Owing to the provision of a vertically adjustable weight serving toguide the thread and causing the thread to run off the bobbin always ata right angle relatively to the axis of the bobbin, the stress exertedupon the thread is reduced to the lowest amount. In consequence of saidpull of the thread directed at right angles to the axis of the bobbin,the whole pull of the thread acts as a circumferential force tending torotate the bobbin.

It will be noted that the thread detector 7 is limited in its'upwardmovement by the stops 9 and the take-up spring 9 is connected at itslower end to the detector, so that the roller it will not by reason ofhigh speed only, release the locking lever 7a is.

I claim- 7 o 1. In a yarn carrier for braiding machines, a spindle onwhich the bobbin rotates, a post substantially parallel to said spindle,a thread guard slidable on said-post, stops for said guard, tensionmeans and take-up mechanism on the post and connected to said guard, anda locking and releasing member for the bobbin mounted on said post andcontrolled by the yarn and the take-up mechanism.

2. In ayarn carrier for braiding machines, a spindle on which the bobbinrotates, a post arranged laterally of said spindle and having lateralstops, a weight slidable on said post and limited by said stops, tensionand take-up mechanism on said post and normally holding said weightagainst said stops, and a member on said post controlled by the yarn andsaid mechanism for locking and releasing the bobbin.

3. In a yarn carrier for braiding machines, a spindle on which thebobbin rotates,

a post arranged laterally of said spindle and 7 means on the post forchanging the tension on the thread, stops on the post, a weight slidableon the post, a take-up mechanism normally holding said weight againstsaid stops, and a pivoted locking leverffor the bobbin held in lookingposition by the yarn and released therefrom by the take-up.

4. In a yarn carrier for braiding machines, a spindle on which thebobbin is rotatably mounted, a post arranged laterally of said spindleand having a thread eye and a thread at its top, and a plurality ofthread guides at different elevations at its side, said post also havina longitudinal slot, a roller D guided in said slot, a spring secured atone end to said roller and the other end fastened near thebottom of saidpost, a pivoted locking lever whosetail passes through the slot find isarranged to lock and release the bob- 5. In a yarn carrier for braidingmachines, a spindle on which the bobbin is rotatably mounted, a postarranged laterally of said spindle and having lateral stops near itsbottom and a longitudinal slot, a weight slidable on said post belowsaid stops, a roller guided in said slot, a spring connected at one endto said roller and at the other end to said weight,a locking lever forthe bobbin pivoted on said post the tail of which passes throughsaidslot and has a thread guide, said lever arranged to swing beyond themaximum diameter oi the-bobbin to permit the ready exchange of bobbinsIn testimony that I claim the foregoing as my invention, I have signedmy name.

CARL WILD I.

' WVitnesses .Aimonn LEHNER, V

TEAN SOHAAD.

